Check out this cool extension for Firefox by Kevin Miller http://www.perpetual-motion.com/ It basically wraps the native CardSpace implementation on Windows so you can use it from Firefox. Very robust looking parsing card detection, and the ability to implement an XPCOM interface to plugin other selectors: IIdentitySelector..GetBrowserToken(issuer , recipientURL, requiredClaims ,data.optionalClaims , tokenType, privacyPolicy, privacyPolicyVersion , serverCert ); The selector implementation can be
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